The suggested ratio for inspiration and expiration time during normal spontaneous breathing is 1:1.5 to 1:2 s with an inspiratory time of 0.8 to 1.2 s.
The inspiratory time can be calculated by dividing the tidal volume by the inspiratory flow. Thus, decreasing the VT or increasing the inspiratory flow, there is a decrease in the inspiratory time.
With this information, we can conclude that the suggested ratio for inspiration and expiration time during normal spontaneous breathing is 1:1.5 to 1:2s with an inspiratory time of 0.8 to 1.2 s. During mechanical ventilation, it will depend on the tidal volume, respiratory rate, inspiratory flow and inspiratory pause.
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